How does tubular secretion differ from tubular reabsorption?

• A. Tubular secretion involves the movement of substances from the filtrate into the blood, while tubular reabsorption involves the opposite.
• B. Tubular secretion occurs only in the glomerular capsule, while reabsorption occurs throughout the nephron.
• C. Tubular secretion involves the addition of substances from the blood into the filtrate, whereas reabsorption involves reclaiming substances from the filtrate back to the blood.
• D. Tubular secretion is responsible for forming the initial filtrate, whereas reabsorption removes waste products.

Answer: (C)